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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_SWIOTLB_H
#define __LINUX_SWIOTLB_H
#include <linux/dma-direction.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/limits.h>
#include <linux/spinlock.h>
struct device;
struct page;
struct scatterlist;
enum swiotlb_force {
SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */
SWIOTLB_FORCE, /* swiotlb=force */
SWIOTLB_NO_FORCE, /* swiotlb=noforce */
};
/*
* Maximum allowable number of contiguous slabs to map,
* must be a power of 2. What is the appropriate value ?
* The complexity of {map,unmap}_single is linearly dependent on this value.
*/
#define IO_TLB_SEGSIZE 128
/*
* log of the size of each IO TLB slab. The number of slabs is command line
* controllable.
*/
#define IO_TLB_SHIFT 11
#define IO_TLB_SIZE (1 << IO_TLB_SHIFT)
/* default to 64MB */
#define IO_TLB_DEFAULT_SIZE (64UL<<20)
extern void swiotlb_init(int verbose);
int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
extern unsigned long swiotlb_nr_tbl(void);
unsigned long swiotlb_size_or_default(void);
extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
extern int swiotlb_late_init_with_default_size(size_t default_size);
extern void __init swiotlb_update_mem_attributes(void);
phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
size_t mapping_size, size_t alloc_size,
enum dma_data_direction dir, unsigned long attrs);
extern void swiotlb_tbl_unmap_single(struct device *hwdev,
phys_addr_t tlb_addr,
size_t mapping_size,
enum dma_data_direction dir,
unsigned long attrs);
void swiotlb_sync_single_for_device(struct device *dev, phys_addr_t tlb_addr,
size_t size, enum dma_data_direction dir);
void swiotlb_sync_single_for_cpu(struct device *dev, phys_addr_t tlb_addr,
size_t size, enum dma_data_direction dir);
dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
size_t size, enum dma_data_direction dir, unsigned long attrs);
#ifdef CONFIG_SWIOTLB
extern enum swiotlb_force swiotlb_force;
/**
* struct io_tlb_mem - IO TLB Memory Pool Descriptor
*
* @start: The start address of the swiotlb memory pool. Used to do a quick
* range check to see if the memory was in fact allocated by this
* API.
* @end: The end address of the swiotlb memory pool. Used to do a quick
* range check to see if the memory was in fact allocated by this
* API.
* @nslabs: The number of IO TLB blocks (in groups of 64) between @start and
* @end. This is command line adjustable via setup_io_tlb_npages.
* @used: The number of used IO TLB block.
* @list: The free list describing the number of free entries available
* from each index.
* @index: The index to start searching in the next round.
* @orig_addr: The original address corresponding to a mapped entry.
* @alloc_size: Size of the allocated buffer.
* @lock: The lock to protect the above data structures in the map and
* unmap calls.
* @debugfs: The dentry to debugfs.
* @late_alloc: %true if allocated using the page allocator
*/
struct io_tlb_mem {
phys_addr_t start;
phys_addr_t end;
unsigned long nslabs;
unsigned long used;
unsigned int index;
spinlock_t lock;
struct dentry *debugfs;
bool late_alloc;
struct io_tlb_slot {
phys_addr_t orig_addr;
size_t alloc_size;
unsigned int list;
} slots[];
};
extern struct io_tlb_mem *io_tlb_default_mem;
static inline bool is_swiotlb_buffer(phys_addr_t paddr)
{
struct io_tlb_mem *mem = io_tlb_default_mem;
return mem && paddr >= mem->start && paddr < mem->end;
}
void __init swiotlb_exit(void);
unsigned int swiotlb_max_segment(void);
size_t swiotlb_max_mapping_size(struct device *dev);
bool is_swiotlb_active(void);
void __init swiotlb_adjust_size(unsigned long size);
#else
#define swiotlb_force SWIOTLB_NO_FORCE
static inline bool is_swiotlb_buffer(phys_addr_t paddr)
{
return false;
}
static inline void swiotlb_exit(void)
{
}
static inline unsigned int swiotlb_max_segment(void)
{
return 0;
}
static inline size_t swiotlb_max_mapping_size(struct device *dev)
{
return SIZE_MAX;
}
static inline bool is_swiotlb_active(void)
{
return false;
}
static inline void swiotlb_adjust_size(unsigned long size)
{
}
#endif /* CONFIG_SWIOTLB */
extern void swiotlb_print_info(void);
extern void swiotlb_set_max_segment(unsigned int);
#endif /* __LINUX_SWIOTLB_H */
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